Document Detail


Synchronization of circadian oscillation of phosphorylation level of KaiC in vitro.
MedLine Citation:
PMID:  20513390     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In recent experimental reports, robust circadian oscillation of the phosphorylation level of KaiC has been reconstituted by incubating three cyanobacterial proteins, KaiA, KaiB, and KaiC, with ATP in vitro. This reconstitution indicates that protein-protein interactions and the associated ATP hydrolysis suffice to generate the oscillation, and suggests that the rhythm arising from this protein-based system is the circadian clock pacemaker in cyanobacteria. The mechanism of this reconstituted oscillation, however, remains elusive. In this study, we extend our previous model of oscillation by explicitly taking two phosphorylation sites of KaiC into account and we apply the extended model to the problem of synchrony of two oscillatory samples mixed at different phases. The agreement between the simulated and observed data suggests that the combined mechanism of the allosteric transition of KaiC hexamers and the monomer shuffling between them plays a key role in synchronization among KaiC hexamers and hence underlies the population-level oscillation of the ensemble of Kai proteins. The predicted synchronization patterns in mixtures of unequal amounts of two samples provide further opportunities to experimentally check the validity of the proposed mechanism. This mechanism of synchronization should be important in vivo for the persistent oscillation when Kai proteins are synthesized at random timing in cyanobacterial cells.
Authors:
Tetsuro Nagai; Tomoki P Terada; Masaki Sasai
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Biophysical journal     Volume:  98     ISSN:  1542-0086     ISO Abbreviation:  Biophys. J.     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-06-01     Completed Date:  2010-09-02     Revised Date:  2011-07-28    
Medline Journal Info:
Nlm Unique ID:  0370626     Medline TA:  Biophys J     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2469-77     Citation Subset:  IM    
Copyright Information:
Copyright (c) 2010 Biophysical Society. Published by Elsevier Inc. All rights reserved.
Affiliation:
Department of Computational Science and Engineering, Nagoya University, Nagoya, Japan.
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MeSH Terms
Descriptor/Qualifier:
Algorithms
Allosteric Regulation
Bacterial Proteins / metabolism*
Circadian Rhythm*
Circadian Rhythm Signaling Peptides and Proteins / metabolism*
Computer Simulation
Models, Biological*
Periodicity
Phosphorylation
Protein Multimerization
Synechococcus / physiology*
Chemical
Reg. No./Substance:
0/Bacterial Proteins; 0/Circadian Rhythm Signaling Peptides and Proteins; 0/KaiC protein, cyanobacteria
Comments/Corrections

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